Hi,
I installed my pyro this weekend, pre-turbo, on a 3B. I've read many threads of good information about the subject on these and other websites, but I still have some questions.
- With hot engine, mye EGT readings are approximately 250 F, this is far below the autoignition temperature of diesel. Does this mean mye EGT is lowered substantially on its way from the cylinder to the manifold?
- My max EGT was approx 1150, going close to 100 kph up a steep hill, in 4th gear. This is, as I understand close to the reccomended max limit of 1200F where the aluminium pistons might melt (!?) But if there is a large differnce between EGT and sylinder temp, then shouldn't the pistons melt anyway at this EGT?
According to Wikipedia, the temps in the sylinder are above the point where aluminium melts:
"When a gas is compressed, its temperature rises (see the combined gas law); a diesel engine uses this property to ignite the fuel. Air is drawn into the cylinder of a diesel engine and compressed by the rising piston at a much higher compression ratio than for a spark-ignition engine, up to 25:1. The air temperature reaches 700–900 °C, or 1300–1650 °F."
(http://en.wikipedia.org/wiki/Diesel_engine)
Any comments on this from you?
I installed my pyro this weekend, pre-turbo, on a 3B. I've read many threads of good information about the subject on these and other websites, but I still have some questions.
- With hot engine, mye EGT readings are approximately 250 F, this is far below the autoignition temperature of diesel. Does this mean mye EGT is lowered substantially on its way from the cylinder to the manifold?
- My max EGT was approx 1150, going close to 100 kph up a steep hill, in 4th gear. This is, as I understand close to the reccomended max limit of 1200F where the aluminium pistons might melt (!?) But if there is a large differnce between EGT and sylinder temp, then shouldn't the pistons melt anyway at this EGT?
According to Wikipedia, the temps in the sylinder are above the point where aluminium melts:
"When a gas is compressed, its temperature rises (see the combined gas law); a diesel engine uses this property to ignite the fuel. Air is drawn into the cylinder of a diesel engine and compressed by the rising piston at a much higher compression ratio than for a spark-ignition engine, up to 25:1. The air temperature reaches 700–900 °C, or 1300–1650 °F."
(http://en.wikipedia.org/wiki/Diesel_engine)
Any comments on this from you?
